We have been to SSB the past 4 years in early July and have never seen more than 25 people. Most years there is any where from 8 to 12 couples.
Everyone gets to know each other and after a few days I compare it to "Cheers Bar". Couples walk up and evryone says hello, and the next thing you know you have a drink in front of you at the swim up bar. Great atmosphere.
Steve